Ultra-thick porous films of graphene-encapsulated silicon nanoparticles as flexible anodes for lithium ion batteries

Yue, Hongwei; Wang, Suiyan; Yang, Zhibo; Li, Qun; Lin, Shumei; He, Dawei

doi:10.1016/j.electacta.2015.06.042

Cited by 44 publications

(17 citation statements)

References 45 publications

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“…The peak intensity of metallic silicon is much higher than that of the silicon oxide, indicating that the pure silicon material is mainly composed of metallic silicon. The existence of silicon oxides is due to the oxidation of the silicon species when exposed in air, which could act as a buffer layer for the volume expansion of the active materials upon charge/discharge cycling . The spectrum of Sn 3d (Figure e) region clearly show the binding energies of Sn 3d 3/2 at 495.3 eV and Sn 3d 5/2 at 486.9 eV, which belong to the tin oxidation state in the form of tin oxide .…”

Section: Resultsmentioning

confidence: 99%

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

Jia

Huang

2017

ChemistrySelect

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A hierarchical nanofibrous tin-oxide/silicon composite with tin oxide nanoparticles anchored on the silicon nanofiber surface is fabricated employing natural cellulose substance (ordinary filter paper) as structural template. Tin oxide gel is deposited uniformly onto the surface of the silicon nanofibers that prepared by magnesiothermic reduction of the silica replica of the filter paper, and thereafter, the as-prepared tin-oxide À gel/ silicon nanocomposite is calcined in argon atmosphere to yield the tin-oxide/silicon nanocomposite. The resulted tin-oxide/ silicon nanocomposite possesses a hierarchical network structure that inherited from the initial cellulose substance. When the nanocomposite is evaluated as an anode material in lithium-ion batteries, it exhibits superior lithium storage properties compared with the pure silicon nanofiber and tin oxide powder matters. For such a nanocomposite with 58.8 wt% tin oxide content delivers a specific reversible capacity of 547.8 mAh g À 1 after 150 discharge/charge cycles at 100 mA g À 1 . The improved lithium storage performances are attributed to the unique three-dimensional hierarchical porous network structure of the nanocomposite, high dispersed fine tin oxide nanoparticles on the silicon nanofiber surface, as well as the synergistic effects between the silicon nanofibers and the tin oxide nanoparticles on the lithium storage.[a] Dr.

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Section: Resultsmentioning

confidence: 99%

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

Jia

Huang

2017

ChemistrySelect

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“…For cathode materials, it is generally believed that nickel rich ternary materials and high voltage materials are the most promising ones . As for anode materials, silicon has attracted the most concerns due to its highest theoretical lithium intercalation capacity, low insertion voltage and rich storage in earth . Nevertheless, silicon suffers from severe volume expansion during the insertion process of lithium ions, which leads to the collapse of anode structure and the spalling of active materials.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the low conductivity also hinders its application in LIBs . Therefore, researchers have taken a series of measures to improve lithium storage performance of silicon‐based materials, such as designing hybrid materials to improve the conductivity, surface treatment to form a stable SEI film, fabrication of core/shell structure using “buffer skeleton” material to compensate volume expansion, synthesis of silicon‐containing alloys with active or inactive metals to improve the conductivity and stabilize the structure of electrodes However, most of the approaches contain complicated or harsh synthetic processes and suffers from high cost, which might not be appropriate for the application in commercial LIBs .…”

Section: Methodsmentioning

confidence: 99%

“…[14][15][16] As for anode materials, silicon has attracted the most concerns due to its highest theoretical lithium intercalation capacity, low insertion voltage and rich storage in earth. [11,[17][18][19][20] Nevertheless, silicon suffers from severe volume expansion during the insertion process of lithium ions, which leads to the collapse of anode structure and the spalling of active materials. Thus, its capacity fades rapidly in the application course.…”

Section: Improving the Performance Of Sio X /Carbon Materials For Higmentioning

confidence: 99%

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Improving the Performance of SiO_x/Carbon Materials for High Energy Density Commercial Lithium‐Ion Batteries Based on Montmorillonite

et al. 2020

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Silicon is recognized as the most promising anode material for the next-generation battery. In order to improve the processing and electrochemical performances, a silicon-based anode composite was synthesized using silicon, montmorillonite and carboxymethylcellulose (CMC) as raw materials. The processing parameters, such as particle size and specific surface area, were ameliorated to be consistent with those of commercial lithium-ion battery (LIB) anode materials. As an anode composite, it perfectly matched with high nickel ternary cathode materials and showed excellent electrochemical properties. The discharge capacities were all above 1000 mAh/g and the coulombic efficiency of each step was over 99 % throughout the 50 cycles at 1 C (1100 mA/g). Its superior performances are attributed to the unique layered structure, which buffers the volume expansion and enhances the stability of the solid electrolyte interface (SEI) film on the anodic electrode, suggesting a perspective future in designing high energy density commercial LIBs.

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“…Encapsulation for Hollowed Core–Shell AMs : Encapsulation is widely used to prepare special hollowed core–shell structure for especially high‐capacity active materials, such as silicon, sulfur, and aluminum . The hollow structure can reduce the damage to the conductive network structures during volume change.…”

Section: Controlling Etn In Composite Electrodesmentioning

confidence: 99%

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Wang

Min

et al. 2018

Advanced Materials

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portable electronics, cell phones, electrical vehicles (EVs), aerospace, etc. For advanced batteries, higher and higher energy density and/or power density, long cycling stability, good device safety, and low-cost are the primary goals. Since the energy density is mainly dependent on the specific capacity and loading level of active materials (AMs), AMs usually dominate the volume and weight inside the batteries. Because of this, tremendous efforts have been focused on high-performance AMs. However, the electrochemical performance of energy storage devices (ESDs) is fundamentally determined by a collective contribution or teamwork of all the components: AMs, electrolyte, separator, conductive agent, binders, etc. More importantly, with the increasing interests on high-capacity AMs (e.g., silicon, sulfur, Li-rich cathode, etc.), it becomes very clear that the "traffic system" (i.e., the charge transport system) plays very critical roles in the performance of the high-capacity AMs. Take silicon anode for example, a durable and flexible conductive network inside the electrode composite has been vital for addressing the big volume change issue. In this case, high-performance binders and conductive agent that can generate advanced conductive network are the keys. [2] In addition, with the increasing interests on EVs and flexible electronics, building a powerful and robust charge transport system inside ESDs is an urgent and critical task to support fast charging/ discharging capability and even flexibility of ESDs. In short, with the fast development of energy storage technologies, EVs, cell phones, etc., there is a critical, urgent, and challenging task on building powerful and durable charge transport system in next-generation advanced ESDs. Charge Transport Inside ESDsThe thriving of big cities highly relies on a powerful traffic system that transports the people, foods, products, etc. Similar to this picture, ESDs are powered by the transportation of charges, including both ions and electrons. As illustrated in Figure 1a, one can analogize the charge transport system and AMs in the electrodes of ESDs to the traffic system and buildings (i.e., host system of people), respectively. This analogy example not only help to explain the relationship between The charge transport system in an energy storage device (ESD) fundamentally controls the electrochemical performance and device safety. As the skeleton of the charge transport system, the "traffic" networks connecting the active materials are primary structural factors controlling the transport of ions/electrons. However, with the development of ESDs, it becomes very critical but challenging to build traffic networks with rational structures and mechanical robustness, which can support high energy density, fast charging and discharging capability, cycle stability, safety, and even device flexibility. This is especially true for ESDs with high-capacity active materials (e.g., sulfur and silicon), which show notable volume change during cycling. Therefore, there is an ur...

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Ultra-thick porous films of graphene-encapsulated silicon nanoparticles as flexible anodes for lithium ion batteries

Cited by 44 publications

References 45 publications

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

Improving the Performance of SiO_x/Carbon Materials for High Energy Density Commercial Lithium‐Ion Batteries Based on Montmorillonite

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

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Ultra-thick porous films of graphene-encapsulated silicon nanoparticles as flexible anodes for lithium ion batteries

Cited by 44 publications

References 45 publications

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

A Hierarchical, Nanofibrous, Tin‐Oxide/Silicon Composite Derived from Cellulose as a High‐Performance Anode Material for Lithium‐Ion Batteries

Improving the Performance of SiOx/Carbon Materials for High Energy Density Commercial Lithium‐Ion Batteries Based on Montmorillonite

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

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Improving the Performance of SiO_x/Carbon Materials for High Energy Density Commercial Lithium‐Ion Batteries Based on Montmorillonite